Office



(No Model.)

G H DIMOND & W F DIAL TRIMMER MECHANISM PQR-sEWING MAOHINES.

Patented June 11, 1895 i 3 w Zr UNITE STATES PATENT Erica.

GEORGE H. DIMOND AND WILBUR F. DIAL, OF BRIDGEPORT, CONNECTICUT,

ASSIGNORS TO THE WHEELER OF SAME PLACE.

& WILSON- MANUFACTURING COMPANY,

TRIMMER MECHANISM FOR SEWING-MACHINES.

SFEGIFIGATION forming part of Letters Patent No. 540,907, dated June ll, 1895.

App e filed December 5, 1894. Serial No. 530,851. (No model.)

' thereto by connections'between it and some moving part of the machine.

In machines of the class described, so far as we are aware, it is very difficult, or altogether impossible, to throw the cutter into or out of operation without first slowing down or stopping the sewing machine, resulting in loss of time to the operator and necessitating the use of both hands to control the operation of the trimmer mechanism. I 2 5 Our invention has for its object the production of a compact, simple and durable trimmer mechanism controllable at all times, whether the machine is running. at high or low speed, and within easy each reach of the 0 operator, who can guide the work with one hand and with the other quickly throw the cutter into or out of operation.

In accordance therewith our invention consists, in a sewing machine, of a cutter, a re- 3 5 ciprocating cuttercarrier, a rocking lever connected thereto to reciprocate it, a rotating cam, connections intermediate said cam and lever, to rock the latter, and means to move said connect-ions independently of the lever 40 into and out of operative contact with the cam, to thereby actuate or stop the cuttercarrier during the operation of the machine, substantially as will be described.

Other features of our invention will be hereinafter described and-particularlypointed out in the claims.

Figure 1, in end elevation and partly broken out, represents asufficient portion of the outer end of the overhanging arm of a sewing-ma- 5o chine to be understood with our invention applied thereto. Fig. 2 is a side elevation thereof, partly broken out. Fig. 3 is a vertical transverse section taken on the line 0c 00, Fig. 1. Fig. 4 is a top View ofa portion of themechanism shown in Fig. 2, and Fig. 5 represents the surface of the actuating-cam, developed.

Referring to the drawings, the arm A,nee-

die and 'presser-bars A and A respectively,

and the needle-bar actuating-shaft A are and may be of usual construction and operation, the same forming no part of our invention. 1 a

The trimming blade or cutter a is secured in usual manner to a reciprocating cuttercarrier a mounted in suitable bearings in the head A of the arm A, said cutter-carrier being slotted at its upper end to receive aslideblock a connected by a species of ball and socket joint to one arm b of a rocking lever, shown in Fig.3as screwed upon the threaded and reduced end of a hollow sleeve 12 mounted to rock in the bearing 12 in a stand B, secured to the overhanging arm, in suitable manner,

as by screws 3. The sleeve is shouldered in- 7,5

ternally at b and has an annular flange b at one end to rest against the bearing b the attached portion of the rocking lever resting against the other end of said bearing and thereby preventing longitudinal movement of the sleeve therein.

A shouldered shaft 0 provided with a suitable thumb-nut c and threaded at its extremity, as at 0 is passed through the sleeve b and through an arm 01 held on and to be moved by the shaft by a suitable nut c". i A spring 8 within the sleeve surrounds the re duced portion of the shaft 0 between the shoulder b of the sleeve and the larger part of the shaft, so that the spring normally tends to keep the parts in the position shown in Fig. 3.

A stud 61, secured to the arm (1 and projecting from its inner side, enters a suitable hole in the arm I) of the rocking lever, so that 5 movement of the arm I) about its pivotal support will also swing the rocking lever and its attached sleeve, as shown in full and dotted lines Fig. 2, or vice Versa.

By moving the shaft 0 in the direction of.

the arrow Fig. 3, the arm d willbe moved into dotted line position,but without Withdrawing the stud d from engagement with the arm I), said stud having a depression at" in its inner end. See dotted lines Figs. 3 and t.

A suitable pin or post d on the swinging arm, extends from its inner face and has there on a roll (1 to enter the groove 6 of an actuating cam E, fast on the needlebar actuating shaft A The shape of the groove 6 in the cam, shown developed in Fig. 5, is such that when the roll 61 is in engagementtherewith, rotation of the cam will swing the arm (Z, and by means of its connection with the lever I), Z), the cutter-carrier a will be reciprocated. Therear wall of the cam grooveeis of greater diameter than the front wall, as shown in Figs. 2 and 5, so that when the roll d is in dotted line position, Fig. 3, it can be swung to the right, viewing Fig. 2, to clear the front wall of the groove 6, and thereby move the cutter mechanism into inoperative position; but the higher rear wall will act as a barrier against movement of the roll d to the left, and consequently prevents throwing down of the cutter into the path of the hook.

hen it is desired to throw the cutter out of operation, the operator grasps the thumbnut c and pushes it in the direction of the arrow Fig. 3, thereby moving the swinging arm d bodily away from the side of the arm Aand withdrawing the roll from the cam groove e. A partial turn of the thumb-nut in the direction of the arrow Fig. 2, then swings the arm (I and carries the roll to one side of the cam. The stud d is thereby brought into position to permit the pointed endof a screw 10 to enter the depression d to positively hold or look the mechanism out of operation, the adjacent portion of the arm A being cut away to 'permit the swinging movementof the stud d. The rotative movement of the thumb-nut and shaft 0 also turns the lever 12,12, by means of the connecting stud d into the dotted line position shown in Figs. 1 and 2, to lifit the cutter carrier and maintain it in inoperative position, with the cutter lifted away from the work.

An adjustable stop pin 0, shown asascrew extended through the thumb-nut c, limits the movement of the shaft 0 in the direction of the arrow Fig. 3, so that it may not be pushed out to an unnecessary extent.

The spring 8 keeps the roll d in engagement with the cam when the cutter-carrier is reciprocated, or holds the stud up against the bottom of the cut away or recessed part of the overhanging arm when the cutter-carrier is inoperative.

The cutter may be thrown into and out of operation, during the operation of the machine, by a slight movement of one of the operators hands, and the whole mechanism is mounted within convenient reach of the operator seated before the usual work table D.

As herein shown, the mechanism for actuatingand controlling the cutter carrier is very simple, strong and compact, and not liable to get out of order.

As the lever arm Z) rocks with the rotation of the cam, the ball and socket connection with the slide-block a gives a positive yet easy connection with the cutter-carrier a.

While we have shown a roll (1 mounted on the pin 01 to enter the cam groove, it is obvious that any other suitable stud might be used, and while it is preferable to bring the end of the stud (1' into positive engagement with the screw 10, to lock the cutter-carrier in inoperative position, it will be obvious that the cutter-carrier could be held inoperative by moving the cam roll or stud d onto the smaller cylindrical portion e of the cam, if desired, or against a part of the arm A, with the same results.

Our invention is not restricted in its application to the precise form of sewingmachine partly illustrated herein, as it is adapted to be used with any class of machine having a conveniently located rotating shaft to which the actuating cam may be secured.

We claim 1. In a sewing machine, a cutter, a reciprocating cutter-carrier, a rocking lever connected thereto to reciprocate it, a rotating cam, connections intermediate said cam and lever, to rock the latter, and means to move said connections independent of the lever into and out of operative contact with the cam, to thereby actuate or stop the cuttercarrier during the operation of the machine, substantially as described.

2. In a sewing machine, a cutter, a reciprocating cuttercarrier, a rocking lever connected thereto to reciprocate it, a rotating cam, an arm laterally movable with relation to and connected to rock said lever, a stud on said arm to operativcly contact with said cam, and means to move said arm laterally to dis engage it from the cam, to thereby stop the reciprocation of the cutter-carrier during the operation of the machine,substantially as described.

3. In a sewing machine, a cutter, a reciprocating cutter-carrier, a rotating cam, a rocking sleeve, a lever connected rigidly thereto to reciprocate said cutter'carrier, a spring-controlled shaft longitudinally movable and rotatable in the sleeve, and an arm on said shaft; connected to the rocking lever and having a stud adapted to operatively contact with said cam, whereby a longitudinal and rotative movement may be given the shaft by the operator so as to disengage said stud and cam and lift the cutter-bar, substantially as described.

4t. In a sewing machine, a cutter, a reciprocating cutter-carrier, a rocking lever connected thereto to reciprocate it, a rotating cam, connections intermediate said cam and lever, to rock the latter, means to move said connections into and out of operative contact with the cam, to thereby actuate or stop the cutter-carrier during the operation of the ma chine, and a locking device to positively hold the cutter-carrier in inoperative position, substantially as described.

5. In a sewing machine, a cutter,areciprocating cutter-carrier, a rocking lever con nected thereto to reciprocate it, a. rotating .cam, an arm laterally movable with relation to and connected to rocksaid lever, a stud on said arm to operativelyconnect with said 6. In a sewing. machine, a cutter, a reciproeating cutter-carrier, a rocking lever connected thereto to reciprocateit,a rotating cam, connections intermediate said cam and lever, to rock the latter, and means located in line with the fulcrum of the said lever, to

move said connections into and out of operative contact with the cam, to thereby actuate or stop the cutter carrier during the operation of the machine, substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

GEORGE I-I. DIMOND. WILBUR F. DIAL.

Witnesses:

ISAAC HOLDEN, A. E. PORTER. 

